1.5 mm thick flat mineral crystal with slight bevel. you test the accuracy of your device. If in the UK - obtain a 10p coin. Royal Mint state that. For example - if you. and when you are finished you can checkout.
3pcs Watch Glass Crystal Lens, 25mm Dia. 1.1mm Thick Double Dome Watch Glass
6pcs Watch Glass Crystal Lens, 40.5mm Dia. 1.1mm Thick Double Dome Watch Glass
3pcs Watch Glass Crystal Lens, 45mm Dia. 1.1mm Thick Double Dome Watch Glass
6pcs Watch Glass Crystal Lens, 30mm Dia. 1.1mm Thick Double Dome Watch Glass
Sternkreuz Watch Glass Crystal Lens - Flat - 2.5mm thick range 18 mm to 45mm
Domed 1mm Watch Glass Crystal Lens With Gasket Choices 17mm to 50mm Range
